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Which statement best explains how the solution should be made?
Add 49.6 mL of 0.250 M sucrose to 400.0 mL of water to get 400.0 mL of 0.0310 M sucrose.
Add 49.6 mL of 0.0310 M sucrose to 350.4 mL of water to get 400.0 mL of 0.250 M sucrose.
Add 49.6 mL of 0.250 M sucrose to 350.4 mL of water to get 400.0 mL of 0.0310 M sucrose.
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The third statement is correct.
Using C1V1 = C2V2: V1 = (C2·V2)/C1 = (0.0310·400.0)/0.250 = 49.6 mL. So you should add 49.6 mL of 0.250 M sucrose to 350.4 mL of water (49.6 + 350.4 = 400.0 mL) to make 400.0 mL of 0.0310 M.
The first is wrong because adding 49.6 mL stock to 400.0 mL water gives 449.6 mL final volume, not 400.0 mL. The second is impossible because you cannot make a 0.250 M solution by diluting a 0.0310 M stock.
Using C1V1 = C2V2: V1 = (C2·V2)/C1 = (0.0310·400.0)/0.250 = 49.6 mL. So you should add 49.6 mL of 0.250 M sucrose to 350.4 mL of water (49.6 + 350.4 = 400.0 mL) to make 400.0 mL of 0.0310 M.
The first is wrong because adding 49.6 mL stock to 400.0 mL water gives 449.6 mL final volume, not 400.0 mL. The second is impossible because you cannot make a 0.250 M solution by diluting a 0.0310 M stock.
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